Make DSD (DSF format) conditional on taglib support

[tmzullinger]

The functions required by 832df65 (Add DSD (DSF format) support (#178), 2026-03-22) are present only in taglib >= 2.0, with TagLib::DSF::File added in taglib commit 39d1d682 (DSD Stream File (DSF) support, 2023-09-25).

Rather than increase the minimum taglib support, make DSD/DSF support conditional as is done for Matroska support.

A downside of using the TAGLIB_WITH_DSF define is that it was added in taglib-2.1, commit ee1931b8 (Compile time configuration of supported formats (#1262), 2025-02-02), while TagLib::DSF::File was added in taglib-2.0 (in the commit noted above).

To avoid this, also check for TAGLIB_MAJOR_VERSION > 1.

[tmzullinger]

I ran into this while building 3.8 for a host which had taglib-1.12, which should be new enough but failed because of the unconditional use of TagLib::DSF::File.

This could use only TAGLIB_MAJOR_VERSION > 1 to define HAS_DSF but it seemed cleaner to look at the upstream TAGLIB_WITH_DSF when available and note in the comment when the additional TAGLIB_MAJOR_VERSION check can be removed.

I tested on Fedora 44 (taglib-2.3) and Rocky 9 (taglib-1.12). I also tested the patch with only defined(TAGLIB_WITH_DSF) && TAGLIB_WITH_DSF == 1, only TAGLIB_MAJOR_VERSION > 1, and with both, as I didn't have a handy system which had taglib-2.0 to test against. (Fedora jumped from 1.13 in F43 to 2.1.1 in F44 and has since updated it to 2.3.)